23130312221 has 2 divisors, whose sum is σ = 23130312222. Its totient is φ = 23130312220.

The previous prime is 23130312203. The next prime is 23130312223. The reversal of 23130312221 is 12221303132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20411836900 + 2718475321 = 142870^2 + 52139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23130312221 is a prime.

It is a super-2 number, since 2×23130312221² (a number of 22 digits) contains 22 as substring.

Together with 23130312223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 23130312193 and 23130312202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23130312223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565156110 + 11565156111.

It is an arithmetic number, because the mean of its divisors is an integer number (11565156111).

Almost surely, 2^23130312221 is an apocalyptic number.

It is an amenable number.

23130312221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23130312221 is an equidigital number, since it uses as much as digits as its factorization.

23130312221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 23130312221 its reverse (12221303132), we get a palindrome (35351615353).

The spelling of 23130312221 in words is "twenty-three billion, one hundred thirty million, three hundred twelve thousand, two hundred twenty-one".